#include<stdio.h>
#include"add.h"
#include"sub.h"
int main()
{
    int a=10;
    int b=20;
    printf("%d+%d=%d\n",a,b,my_add(a,b));
    printf("%d-%d=%d\n",a,b,my_sub(a,b));
    return 0;
}
